Added AFB Helper Guide in Developer Guides

Revised and added AFB Helper Guide as a part of Developer Guides.

Bug-AGL: [SPEC-3633]

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: I3df9265ae0570e987d80bc4bd2d3d14e7743b26a
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25665
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/docs/3_Developer_Guides/4_AFB_Helper_Guide/1_Usage.md b/docs/3_Developer_Guides/4_AFB_Helper_Guide/1_Usage.md
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+---
+title: Usage
+---
+
+## Installation
+
+The afb-helpers library is integrated by default in the AGL SDK since the Guppy
+version (>=7) and is also available as a package for the AGL supported linux
+distributions.
+
+You could find the SDK build from Yocto which embed the afb-helpers library
+here:
+
+- **x86** : [qemux86-64](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemux86-64/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-corei7-64-qemux86-64-toolchain-10.90.0+snapshot.sh)
+
+- **ARM 32 bit** : [qemuarm](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemuarm/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-armv7vet2hf-neon-vfpv4-qemuarm-toolchain-10.90.0+snapshot.sh)
+
+- **AARCH64 - ARM 64bit** : [qemuarm64](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemuarm64/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-aarch64-qemuarm64-toolchain-10.90.0+snapshot.sh)
+
+Then use your package manager to install the library.
+
+### OpenSuse
+
+```bash
+sudo zypper ref
+sudo zypper install agl-libafb-helpers-devel
+```
+
+### Fedora
+
+```bash
+sudo dnf ref
+sudo dnf install agl-libafb-helpers-devel
+```
+
+### Ubuntu/Debian
+
+```bash
+sudo apt-get update
+sudo apt-get install agl-libafb-helpers-dev
+```
+
+## (Optional) Remove the git submodule version
+
+If you already use the afb-helpers component but using the submodule version
+then you have to get rid of it to be sure to link and use the library version.
+To do so, you have to do the following:
+
+* Deinitialize the submodule using `git`
+
+```bash
+# This example assumes that the git submodule is named app-afb-helpers-submodule
+# and is located at your root project repository.
+git submodule deinit app-afb-helpers-submodule
+```
+
+* Remove the submodule relatives lines from the `.gitmodules` file
+
+```bash
+vim .gitmodules
+```
+
+* Remove the `afb-helpers` target link from any CMake target you specified.
+ Those lines look like:
+
+```bash
+TARGET_LINK_LIBRARIES(${TARGET_NAME}
+    afb-helpers # REMOVE THIS LINE
+    ${link_libraries}
+    )
+```
+
+## Add the libafb-helpers as a static library to your binding
+
+In your `config.cmake` file, add a dependency to the controller library, i.e:
+
+```cmake
+set(PKG_REQUIRED_LIST
+	json-c
+	afb-daemon
+	afb-helpers --> this is the afb-helpers library dependency name.
+)
+```
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